EP2468435A1 - Method for producing sintered copper article for craft or decorative use and copper-containing plastic composition - Google Patents

Method for producing sintered copper article for craft or decorative use and copper-containing plastic composition Download PDF

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Publication number
EP2468435A1
EP2468435A1 EP10809990A EP10809990A EP2468435A1 EP 2468435 A1 EP2468435 A1 EP 2468435A1 EP 10809990 A EP10809990 A EP 10809990A EP 10809990 A EP10809990 A EP 10809990A EP 2468435 A1 EP2468435 A1 EP 2468435A1
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EP
European Patent Office
Prior art keywords
copper
powder
shaped
plastic
clay compound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10809990A
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German (de)
English (en)
French (fr)
Inventor
Tomoaki Kasukawa
Akiyoshi Yatsugi
Masashi Hirama
Hidekazu Yoshihara
Ryota Mitsuhashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aida Chemical Industries Co Ltd
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Aida Chemical Industries Co Ltd
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Filing date
Publication date
Application filed by Aida Chemical Industries Co Ltd filed Critical Aida Chemical Industries Co Ltd
Publication of EP2468435A1 publication Critical patent/EP2468435A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • A44C27/001—Materials for manufacturing jewellery
    • A44C27/002—Metallic materials
    • A44C27/003—Metallic alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles
    • B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/102—Metallic powder coated with organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the present invention relates to a method for producing a sintered copper article for craft or decorative use made from copper or a copper alloy, and a plastic copper containing clay compound.
  • the plastic copper containing clay compound can be sintered in the air using a general heating furnace or the like.
  • a plastic copper containing composition which is prepared by mixing a copper powder or a copper alloy powder with an organic binder into a clay-like compound, has been well known as a copper material for an artistic craft use.
  • a shaped copper sinter is obtained by shaping the plastic copper containing clay-like compound, and sintering a shaped copper object.
  • Patent Documents 1 to 4 disclose the above mentioned method.
  • Patent Documents 1 and 2 disclose use of a plastic clay-like compound prepared by a mixed powder of a first metallic particle with a mean particle diameter of 3 to 8 ⁇ m in the range of 25 wt% or more to less than 100 wt% and a second metallic particle with a mean particle diameter of 15 to 25 ⁇ m in the range of more than 0 wt% to 75 wt% or less, together with an organic binder.
  • Patent Document 1 and ⁇ Example 19> described in the paragraph [0028] of Patent Document 2 disclose use of a clay-like compound prepared by combining a first copper particle with a mean particle diameter of 5 ⁇ m in 75 wt% and a second copper particle with a mean particle diameter of 20 ⁇ m in 25 wt%.
  • a shaped object made from a mixed material composed of the two kinds of the above mentioned copper particles is sintered in the inert atmosphere with introducing nitrogen gas or argon gas into an electric furnace. This is a sintering condition described in ⁇ Example 19>.
  • Patent Document 3 discloses a method for sintering, comprising the steps of: primarily sintering a plastic clay-like compound including a mixed precious metal powder containing silver and copper powders in the oxidation atmosphere at 400°C or more, and subsequently secondarily sintering the clay compound in the reduction atmosphere at 800°C or more. More specifically, Patent Document 3 describes in EXAMPLES, methods using a mixed powder prepared by combining a pure Cu powder having a mean particle diameter of 18 ⁇ m with a powder of Cu-50wt% Ni alloy having a mean particle diameter of 20 ⁇ m, in 2.0 to 12.5 wt%.
  • Patent Document 4 discloses a method, comprising the steps of: primarily sintering a plastic clay compound including a powder containing a copper powder or a copper alloy powder or the like in the oxidation atmosphere at 230 to 300°C for 4 to 6 hr, and subsequently secondarily sintering the resultant compound in the reduction atmosphere at 700 to 1000°C for 2 to 3 hr.
  • EXAMPLES is disclosed a method using a spherical copper powder with a mean particle diameter of 37 ⁇ m. Namely, it is reported that a formed object made of a clay compound containing the above mentioned copper powder and an organic binder is degreased in the air at about 250°C for 5 hr.
  • the formed object is primarily sintered in the oxidation atmosphere as disclosed in Patent Documents 3 and 4 on the assumption that the formed object is secondarily sintered in the reduction atmosphere. Therefore, as mentioned above, if the formed object is sintered only in the oxidation atmosphere, the sintered formed object can not become a precious metal decorative article and a precious metal artistic craft article.
  • Patent Documents 5 to 7 disclose methods for producing a sintered product, comprising the steps of:
  • a plastic copper containing clay-like compound prepared by mixing a copper powder or a copper alloy powder together with an organic binder is sintered in the inert atmosphere or in the reduction atmosphere.
  • the sintered shaped copper sinter has extremely weak strength.
  • the clay-like compound has to be sufficiently sintered, resulting in inevitable requirement of a long sintering time.
  • the degree of the oxidation portion from the surface to the inside part of the sinter more increases. Accordingly, the sintered shaped copper sinter crumbles and can not be tolerated in use.
  • the composite shaped object is prepared by combining a plastic copper containing clay-like compound including copper or a copper alloy with a plastic precious metal claylike compound including a precious metal such as silver; the precious metal having an anti-oxidation property capable of not being oxidized in the air during the sintering process.
  • the present inventors have investigated to provide a plastic copper containing clay compound that can be sintered in the air using a general heating furnace or the like.
  • the plastic copper containing clay compound has been a target of the investigation. That is, the plastic copper containing clay compound includes copper or a copper alloy having a variety of colors including a brown color of copper, a bronze color of a copper-tin alloy, a white color of a copper-nickel alloy, and a yellow color of a copper-zinc alloy.
  • the present inventors find that restriction of the copper powder or the copper alloy powder included in the plastic copper clay compound to the prescribed powder having a mean particle diameter of 10 ⁇ m or less allows the sinter article for craft or decorative use to have the strength required for the sintered article for craft or decorative use, even though the shaped copper object is sintered in the air. Further the restriction also allows the sintering time to be shortened, and the appearance of the resultant sintered product to be sufficiently accepted as a sintered article for craft or decorative use. Based on the above mentioned findings, the present invention is finally achieved.
  • At least one kind of a powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more included in the clay compound is restricted to the powder having a mean particle diameter of 10 ⁇ m or less to form a shaped copper object.
  • This restriction of the mean particle diameter allows a shaped copper sinter to have the prescribed strength required for the sintered copper article for craft or decorative use, and the sintering process to be completed in a short time, even though the shaped copper object formed by using the clay compound is sintered in the air.
  • the surface of the shaped copper sinter made of copper or a copper alloy is very thinly oxidized when the shaped copper object is sintered in the air, the inside part of the shaped copper sinter is not influenced by the oxidation. Accordingly, this facilitates an oxidation film formed on the surface of the shaped copper sinter to be easily detached, and the appearance of the resultant shaped copper sinter to be sufficiently accepted as a sintered article for craft or decorative use. Therefore, since the sintering of the present invention is not conducted in the reduction atmosphere as performed in conventional techniques, the following complicated procedures can be avoided. That is, it is not necessary to continuously flow the inert gas such as argon gas and nitrogen gas.
  • the inert gas such as argon gas and nitrogen gas.
  • the method for producing a sintered copper article of the present invention allows the method for producing a sintered copper article of the present invention to be more easily used in a further education school or the like.
  • the shaped copper sinter made from the clay compound of the present invention is combined with the shaped precious metal sinter made from the plastic precious metal containing clay compound including a precious powder metal such as silver to form a decorative article, the shaped copper object and the shaped silver object can be sintered in the air using the same atmospheric condition and the same sintering equipment can be used, resulting in the extremely excellent and efficient method.
  • the method for producing a sintered copper article for craft or decorative use comprising the steps of: forming a shaped copper object using a plastic copper containing clay compound including at least one kind of a powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more together with an organic binder, and subsequently sintering a shaped copper object to obtain a shaped copper sinter.
  • the plastic copper containing clay compound is prepared by a mixed powder including a first powder in 25 to 75 wt% with a mean particle diameter of 0.1 to 4 ⁇ m, and the remainder of a second powder with a mean particle diameter in the range of more than 4 ⁇ m to 10 ⁇ m or less. Then, the shaped copper sinter is obtained by sintering the shaped copper object in the air.
  • the method for producing the sintered copper article for craft or decorative use in the first aspect of the present invention it is possible to sinter the shaped copper object in the air, which is formed by shaping the clay compound in an optional shape, and to obtain the sintered copper article with the higher strength. Further, it is also possible to suppress the linear shrinkage rate of the clay compound to the same level of 10% as a commercially available plastic silver containing clay compound including a silver powder or a silver alloy powder.
  • the clay compound of the present invention when the clay compound of the present invention is combined with a plastic silver containing clay compound including a silver powder or a silver alloy powder to form a shaped object, the shaped object may be sintered as one body all at once in the air.
  • copper alloy of the present invention mean a copper alloy that contains copper in 50 wt% or more. More preferably, the copper alloy contains no copper oxide. Hereby, it is possible to prevent the resultant sinter from being a porous product by containing no copper oxide in the copper alloy.
  • mean particle diameter of the copper powder and the copper alloy powder used in the present invention are also referred to as an average grain diameter, a mean particle diameter, a median diameter, a median size, or a 50% particle size; are typically represented as "D50"; and mean a particle size corresponding to 50% of a cumulative distribution curve.
  • the mean particle diameter is a value of D50 of a particle size distribution obtained by using a laser diffraction-type particle size distribution measurement device with tri-laser scattered light detection mechanism (manufactured by Microtrac, Inc.) and setting measurement conditions thereof at [particle permeability: reflection] and [spherical/nonspherical: nonspherical] (that is, setting the particle permeability in reflection, and the selection of spherical/nonspherical in nonspherical).
  • air sintering mean that the sintering process is conducted in the air, and identical to the sintering process conducted in the oxidation atmosphere.
  • the terms "reduction atmosphere” are construed as identical to the inert atmosphere such as the argon gas atmosphere, and include the inert atmosphere.
  • silver alloy and "precious metal” mean a silver alloy and a precious metal of which copper contents are less than 20 wt%.
  • such a silver alloy and a precious metal contain no copper.
  • such a silver alloy and a precious metal mean a silver alloy and a precious metal, both of which have an anti-oxidation property, preventing the shape of sintered product from being influenced, even though the air sintering is conducted.
  • Such a “silver alloy” includes, for example, a silver-Pd alloy having improved anti-sulfuration performance.
  • the method for producing a sintered copper article for craft or decorative use further comprises a step of pickling or polishing the sintered copper article for craft or decorative use obtained in the air sintering, in the aforementioned first aspect of the present invention.
  • the inside part of the shaped copper sinter is not influenced by the oxidation. Accordingly, this facilitates an oxidation film formed on the surface of the shaped copper sinter to be very easily detached, allowing the appearance of the shaped copper sinter to be sufficiently accepted as a sintered article for craft or decorative use.
  • the plastic copper containing clay compound in the third aspect of the present invention includes at least one kind of a powder selected from a copper powder and a copper alloy powder that contains copper in 50 wt% or more. More specifically, the plastic copper containing clay compound includes a mixed powder including a first powder in 25 to 75 wt% with a mean particle diameter of 0.1 to 4 ⁇ m, and the remainder of a second powder with a mean particle diameter in the range of more than 4 ⁇ m to 10 ⁇ m or less together with an organic binder.
  • the plastic copper containing clay compound in the third aspect of the present invention it is possible to sinter in the air the shaped copper object formed by shaping the clay compound in an optional shape, and to obtain the shaped copper sinter with the high strength. Further, it is also possible to suppress the linear shrinkage rate of the clay compound to the same level of 10% as a plastic silver containing clay compound including a commercially available silver powder or silver alloy powder. Moreover, the sintering process may be completed in a short time, which prevents the inside part of the shaped copper sinter from being influenced by the oxidation, even though the surface of the shaped copper sinter made of copper or a copper alloy is very thinly oxidized in the air sintering.
  • the sintering in the reduction atmosphere as conducted in the prior art is not essential process to be conducted, and the sintering can be conducted in any one of the reduction atmosphere or the oxidation atmosphere.
  • the following complicated procedures can be avoided. That is, it is not necessary to continuously flow the inert gas such as argon gas and nitrogen gas during the sintering process.
  • the shaped object may be sintered as one body all at once in the air.
  • the method for producing the sintered copper article for craft or decorative use in the present invention comprises the steps of: preparing the plastic copper containing clay compound including at least one kind of the powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more, with restricting the mean particle diameter of the powder to the specific particle size of 10 ⁇ m or less; forming the shaped copper object by using the plastic copper containing clay compound; and sintering the shaped copper object in the air using, for example, a general heating furnace.
  • the shaped copper sinter has the prescribed strength required for a sintered article for craft or decorative use, and the sintering process is completed in a short time.
  • this short time sintering prevents the inside part of the shaped copper sinter from being influenced by the oxidation, even though the surface of the shaped copper sinter made of copper or a copper alloy is very thinly oxidized in the air sintering. Accordingly, this facilitates the oxidation film formed on the surface of the shaped copper sinter to be very easily detached, allowing the appearance of the shaped copper sinter to be sufficiently accepted as a sintered article for craft or decorative use. Namely, as mentioned before, it has been known that a shaped copper sinter produced in the air sintering results in a product having extremely weak strength.
  • the method of the present invention at least one kind of the powder selected from a copper powder or a copper alloy powder is restricted to the powder having the specific mean particle diameter of 10 ⁇ m or less.
  • This restriction allows the sintering process to be completed in a short time, and the shaped copper sinter to have the prescribed strength required for the sintered article for craft or decorative use. Therefore, the method of the present invention can be easily used in a further education school or the like.
  • the clay compound of the present invention is combined with a clay compound or the like including a silver powder or a silver alloy powder, so as to form a shaped object, the shaped object (or decorative object) may be sintered in the air by using the same sintering apparatus. This results in a decrease in the cost of equipment.
  • the plastic copper containing clay compound of the present invention using the prescribed mixed copper powder including particles with a mean particle diameter of 10 ⁇ m or less and different mean particle diameters, and the method for producing the sintered copper article of the present invention by using the aforementioned plastic copper containing clay compound.
  • the clay compound of the present invention may be treated indeed similarly to the clay compound which is conventionally known as "precious metal clay” capable of being sintered in the air.
  • the method for producing the sintered copper article of the present invention may be conducted similarly to the conventional methods.
  • the plastic copper containing clay compound used in the present invention includes at least one kind of a powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more together with an organic binder.
  • the powder having the mean particle diameter of 10 ⁇ m or less is used.
  • copper alloys have a variety of colors such as, a bronze color of a copper-tin alloy, a white color of a copper-nickel alloy, and a yellow color of a copper-zinc alloy.
  • a method for producing such a powder including an atomization powder and a reduction powder is not limited specifically.
  • a particle with a substantially spherical shape is preferably used. Since the powder with the mean particle diameter of 10 ⁇ m or less is used, the air sintering process may be completed in a short time, allowing an oxidation film on the surface of the sintered article to be easily detached by rapid cooling, pickling and polishing treatments or the like.
  • the plastic copper containing clay compound used in the first aspect of the present invention is the same plastic copper containing compound used in the third aspect of the present invention.
  • the plastic copper containing composition includes at least one kind of a powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more, including a mixed powder of a first powder in 25 to 75 wt% with a mean particle diameter of 0.1 to 4 ⁇ m, and the remainder of a second powder with a mean particle diameter in the range of more than 4 ⁇ m to 10 ⁇ m or less together with an organic binder.
  • the use of the mixed powder comprising the above mentioned first powder and the second powder allows the shaped copper object, which is formed by shaping the plastic copper containing composition in an optional shape, to be sintered in the air.
  • the use of the mixed powder allows the shaped copper sinter with the higher strength to be obtained, and the linear shrinkage rate of the plastic copper containing composition to be suppressed to the same level of 10% as a commercially available plastic silver clay compound.
  • the use of the mixed powder allows a shaped object to be sintered in the air as one body all at once, when the shaped object is formed in the combination with a commercially available plastic silver containing clay compound or the like.
  • the more preferable plastic copper containing clay compound in the third aspect of the present invention used in the first aspect of the present invention includes at least one kind of a powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more, including a mixed powder of a first powder in 25 to 75 wt% with a mean particle diameter of 0.5 to 4 ⁇ m, and the remainder of a second powder with a mean particle diameter in the range of more than 4 ⁇ m to 10 ⁇ m or less together with an organic binder.
  • the still more preferable plastic copper containing clay compound includes at least one kind of a powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more, including a mixed powder of a first powder in 30 to 70 wt% with a mean particle diameter of 2.0 to 3.0 ⁇ m, and the remainder of a second powder with a mean particle diameter of 5 to 10 ⁇ m or less together with an organic binder.
  • a powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more, including a mixed powder of a first powder in 30 to 70 wt% with a mean particle diameter of 2.0 to 3.0 ⁇ m, and the remainder of a second powder with a mean particle diameter of 5 to 10 ⁇ m or less together with an organic binder.
  • the mixed powder in which the respective ranges of the mean particle diameters of the first powder and the second powder are more specified is used.
  • the use of the mixed powder allows the strength of the sintered article after sintering to be increased, the linear shrinkage rate thereof to be suppressed in an around 10%, the sintering temperature to be lowered, and the sintering time to be shortened.
  • the organic binder usable in this invention is not limited specifically, however, may include at least one member selected from the followings: a cellulose-based binder such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, and carmellose (carboxymethylcellulose),sodium carboxymethyl cellulose, potassium carboxymethylcellulose, and calcium carboxymethylcellulose; an alginic acid-based binder such as sodium alginate; a polysaccharide-based binder such as starch, dogtooth violet starch, wheat flour, British gum, xanthane gum, dextrin, dextran, and pullulan; an animal-derived binder such as gelatin; a vinyl-based binder such as polyvinyl alcohol and polyvinylpyrrolidone; an acryl-based binder such as polyacrylic acid and polyacrylate ester; and other resin-based binder such as polyethylene oxide, polypropylene oxide, and polyethylene glycol, or
  • the air sintering conditions of the above mentioned plastic copper containing clay compound include the following conditions as a standard.
  • the sintering temperature and the time of the plastic copper containing clay compound that contains the powder of pure copper are: at 990°C for 3 to 6 min, at 980°C for 4 to 15 min, at 970°C for 5 to 30 min, at 950°C for 5 to 40 min, at 850°C for 10 to 50 min, and at 800°C for 30 to 60 min.
  • the sintering temperature is preferably 850°C to 980°C, more preferably 950°C to 970°C.
  • the sintering can be conducted in the same temperatures as mentioned above even in the reduction atmosphere. However, in such a case, it is preferable to lengthen the sintering time.
  • a method for producing a decorative article comprising a step of combining the plastic copper containing clay compound in the third aspect of the present invention with a plastic silver containing clay compound including a silver powder or a silver alloy powder, to form the decorative article.
  • the plastic copper containing clay compound is used in the first aspect of the present invention.
  • the plastic copper containing clay compound in the third aspect of the present invention which is used in the first aspect of the present invention, includes at least one kind of a powder selected from a copper powder or a copper alloy powder that contains copper in 50 wt% or more, including a mixed copper powder of a first copper powder in 25 to 75 wt% with a mean particle diameter of 0.1 to 4 ⁇ m, and the remainder of a second copper powder with a mean particle diameter in the range of more than 4 ⁇ m to 10 ⁇ m or less together with an organic binder.
  • the aforementioned copper powder contained in the copper clay compound may be treated in the same manner of the silver powder contained in the silver clay compound conventionally known as a plastic precious metal clay, capable of being sintered in the air.
  • plastic copper clay containing powder of the present invention may be combined with a plastic silver containing composition to form a composite shaped object to form, thereby to obtain a shaped copper-silver sinter by sintering the composite shaped object in the air as one body all at once.
  • the aforementioned plastic silver containing clay compound combined with the plastic copper containing clay compound includes at least one kind of a powder selected from a silver powder or a silver alloy powder, including a mixed silver powder of a first silver powder in 25 to 75 wt% with a mean particle diameter of 0.1 to 4.0 ⁇ m, and the remainder of a second silver powder with a mean particle diameter in the range of more than 4 ⁇ m to 40 ⁇ m or less together with an organic binder.
  • a plastic silver containing composition is commercially available.
  • the more preferable plastic silver containing clay compound includes a mixed silver powder, including a first silver powder in 25 to 75 wt% with a mean particle diameter of 0.5 to 4.0 ⁇ m, and the remainder of a second silver powder with a mean particle diameter in the range of more than 4 ⁇ m to 25 ⁇ m or less together with an organic binder.
  • the still more preferable plastic silver containing clay compound includes a mixed silver powder, including a first silver powder in 30 to 70 wt% with a mean particle diameter of 2. 0 to 3. 0 ⁇ m, and the remainder of a second silver powder with a mean particle diameter of 5 ⁇ m to 20 ⁇ m together with an organic binder.
  • the plastic copper containing clay compound and the plastic silver containing clay compound may be prepared so as to have very similar density and a same level of a linear shrinkage rate each other. Accordingly, this may prevent the shaped copper-silver sinter from being separated or the damage of the shaping after the sintering process. The reason is attributed to that the shrinkage of one of the plastic copper containing clay compound and the plastic silver containing clay compound is not so large compared to the other composition.
  • the method for producing a silver powder included in the plastic silver containing composition is similar to the method for producing a copper powder included in the plastic copper containing clay compound, for example, an atomization powder and a reduction powder, and is not limited specifically. However, a particle with a substantially spherical shape is preferably used. Further, an organic binder similar to the aforementioned organic binders described in the plastic copper containing composition may be used.
  • the decorative object thus formed is sintered in the air at 660 to 770°C for 3 to 40 min.
  • This sintering condition is different from the sintering condition in which the aforementioned plastic copper containing clay compound is sintered alone. Namely, it is particularly preferable to sinter the composite shaped object in the air at a markedly lower temperature and shorter time than the shaped object formed of the plastic copper containing clay compound alone.
  • the composite shaped object may be sintered in the reduction atmosphere at the similar temperatures to the above mentioned temperatures. However, in such a case, it is preferable to increase the temperature and lengthen the sintering time.
  • the first half of the sintering may be conducted in the air in order to burn the organic binder, and the second half of the sintering may be conducted in the reduction atmosphere.
  • the decorative object is immediately taken out from a heating source such as an electric furnace.
  • the resultant decorative object is put together with a reduction agent such as charcoal and sealed in a stainless steel vessel, thereby to put the stainless steel vessel in the electric furnace.
  • the stainless steel vessel is heated from room temperature to 700 to 800°C, and subsequently the heating temperature is kept for 30 min to 9 hr, whereby the decorative object may be sintered in the reduction atmosphere.
  • the sintering process in the argon gas atmosphere the sintering process is conducted by flowing argon gas in the electric furnace so that the air is not entered into the electric furnace.
  • the method is a technique for forming a decorative object as a composite shaped object by appropriately combining the plastic copper containing clay compound and the plastic silver containing clay compound.
  • the method for producing a decorative article having a marble pattern comprises the steps of: forming rod shaped objects by shaping the plastic copper containing clay compound and the plastic silver containing clay compound to form objects in pillar-like shapes respectively, thereby to prepare a rod shaped copper object and a rod shaped silver object; forming a rod shaped mixed object by intertwining and mixing together the rod shaped copper object and the rod shaped silver object after conducting the step of the rod shaped objects; forming a decorative object by flattening at least one portion of the rod shaped mixed object after conducting the step of the rod shaped mixed object; and producing a decorative sinter by sintering the decorative object thus obtained.
  • the rod shaped mixed object may be produced by filling the rod shaped copper object and the rod shaped silver object together into a syringe, and injecting the filled objects from the syringe. Further, the rod shaped mixed object once injected from the syringe may be refilled in the syringe and re-injected to obtain the re-injected rod shaped mixed object. This operation may be repeatedly conducted at least one time to produce the rod shaped mixed object. Further, in the step of forming a rod shaped mixed object, the rod shaped copper object and the rod shaped silver object are intertwined to form a pillar-like object, and then, the pillar-like object is divided into parts or folded back.
  • the resulting pillar-like objects are intertwined to form again a pillar-like object.
  • This operation may be repeatedly conducted at least one time to produce a rod shaped mixed object.
  • the rod shaped mixed object is wound in a plane spiral shape, and then at least the upper surface of the resultant product is flattened to form a plate shaped object, whereby the decorative object may be produced.
  • the rod shaped mixed object is wound in a plane spiral shape, and then the upper surface and the lower surface of the resultant product are flattened to form a plate, whereby the decorative object may be produced by transforming the plate into a ring shaped object.
  • the decorative object when a decorative object is formed as a composite shaped object by appropriately combining the plastic copper containing clay compound in 15 to 85 wt% and the plastic silver containing clay compound in 85 to 15 wt%, the decorative object may be sintered in the air at 700 to 750°C for 10 to 15 min. In such a case, it is particularly preferable to sinter the decorative object at a markedly lower temperature and in a shorter time in the air, than the shaped object made of the plastic copper containing clay compound to be sintered in the air.
  • the shaped sinter sintered as mentioned above allows a decorative article to have a design excellent in a particularly well balanced arrangement of a copper color and a silver color.
  • the additive includes one or more members selected from the followings: organic acid (oleic acid, stearic acid, phthalic acid, palmitic acid, sebacic acid, acetylcitric acid, hydroxybenzoic acid, lauric acid, myristic acid, caproic acid, enanthic acid, butyric acid, capric acid, citric acid); organic acid ester such as n-dioctyl phthalate and n-dibutyl phthalate (organic acid ester having a methyl group, ethyl group, propyl group, butyl group, octyl group, hexyl group, dimethyl group, diethyl group, isopropyl group, and isobutyl group); higher alcohol (octanol, nonanol, decanol); polyoleic acid (oleic acid, stearic acid, phthalic acid, palmitic acid, sebacic acid, acetylci
  • the additive is added so as to improve plasticity or prevent the plastic copper containing clay compound or the plastic silver containing clay compound from sticking to a hand during shaping.
  • the lignin and glycerin above-cited as the additive give an appropriate level of water retentivity.
  • the additive also includes an anionic, cationic, nonionic, or any other surfactant. The surfactant improves miscibility among the silver powder, the copper powder and the organic binder, and improves water retentivity.
  • the water-soluble cellulose-based binder gives plasticity to the plastic copper containing clay compound and the plastic silver containing clay compound.
  • the polyethylene oxide gives a high viscosity at a low concentration and increases adhesiveness in its liquid form.
  • the sodium alginate gives an appropriate level of water retentivity, similarly to glycerin and also helps increase adhesiveness.
  • the polyacrylate ester and polyacrylic acid further increase adhesiveness.
  • the water-soluble cellulose-based binder gives plasticity to the plastic copper containing clay compound and the plastic silver containing clay compound.
  • the water-soluble cellulose- based binder includes: methylcellulose, hydroxyethylcellulose, hydroxypropyl cellulose, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, potassium carboxymethylcellulose, calcium carboxymethylcellulose, etc, and is used by being dissolved in water.
  • the amount of the organic binder in the plastic copper containing clay compound or the plastic silver containing clay compound is preferably in the range of 0.1 to 4 wt% by the dry solids content excluding water as the solvent. In this case, if the content of the organic binder is less than 0.1 wt%, it is difficult to obtain a homogeneous plastic copper containing clay compound or a homogeneous plastic silver containing clay compound. Further, the strength after application or drying becomes disadvantageously lowered. If the content of the organic binder is more than 4 wt%, the shrinkage ratio of the obtained object increases and the object tends to easily crack.
  • the content of the organic binder is preferably in the range of 0.1 to 4 wt%.
  • polyethylene oxide preferably, the polyethylene oxide has a molecular weight from a hundred thousand to several millions, and is used in the range of 0.1 to 3 wt%.
  • a surfactant is used, the content thereof is preferably in the range of 0.03 to 3 wt%.
  • oil is used, the content thereof is preferably in the range of 0.1 to 3 wt%.
  • the plastic copper containing clay compound and the plastic silver containing clay compound used in the present invention can be prepared as a clay-like form, paste-like form or a slurry-like form, by adjusting the content of water.
  • a metallic powder is contained in 75 to 99 wt% in any of the plastic clay compounds.
  • the shrinkage ratio increases thereby to obstruct the sintering, while if the content of the metallic powder is too large, hereby the contents of the organic binder and water are decreased thereby to obstruct the shaping.
  • a powder of Bi, Se, Sb, In, Sn, and Zn or an alloy powder thereof may be added to the clay compound.
  • a glass powder or a metallic powder compound selected from lead carbonate, lithium carbonate, zinc oxide, phosphoric acid, sodium carbonate, vanadium oxide, sodium silicate, phosphate salt, or the like may be added to the clay compound.
  • an organic additive may be added so as to improve the plasticity of the clay compound.
  • the organic additive includes lignin which may be cited as a concrete example of the reticular macromolecular substance that results from the condensation of the component unit having phenylpropane as a backbone, glycerin, diglycerin, isoprene glycol, 1,3-butylene glycol, liquid paraffin, alcohols, oil, phthalic acid, n-dioctyl phthalate, n-dibutyl phthalate, and polyvinyl alcohol.
  • a surfactant and a surface-active agent may be also added where necessary.
  • a metal oxide such as zirconium oxide may be added so as to prevent the deformation of the resultant product in the sintering. That is, the addition of a metal oxide allows the sintering rate to be delayed. This facilitates a gas diffusion passage to be formed, through which gas or the like generated when the organic binder burns diffuses to the outside of the shaped object.
  • a copper powder composing a plastic copper containing clay compound was made of pure copper, and prepared as a mixed copper powder by mixing a first copper powder in 50 wt% with a mean particle diameter of 2.5 ⁇ m and a second copper powder in 50 wt% with a mean particle diameter of 10 ⁇ m. Then, the mixed copper powder in 90 wt%, methylcellulose in 1.20 wt% and sodium carboxymethylcellulose in 0.30 wt% as organic binders, and water in 8.50 wt% were sufficiently mixed to form a clay-like compound. By using the clay-like compound, a sample piece was prepared having a length of 50 mm, a width of 10 mm, and a thickness of 1.5 mm, and dried at 80°C for 30 min.
  • the shrinkage ratio of the sample piece was determined by measuring the lengths thereof before and after drying. Then, the sample piece was sintered in the air (or oxidation atmosphere) by using an electric furnace at 970°C for 30 min to obtain a shaped copper sinter. The surface of the shaped copper sinter thus obtained was polished to produce a test piece.
  • Example A to Example C it was confirmed that when the plastic copper containing clay compounds including the mixed copper powder with a mean particle diameter of 10 ⁇ m or less in Example A to Example C were used, the resultant shaped copper sinters had beautiful surfaces by pickling and polishing treatments after sintering, even if the sintering was conducted in the air. In contrast, when the copper containing clay compounds to which the copper powder with a mean particle diameter of 40 ⁇ m was added in Comparative Example A and Comparative Example B were used, the resultant shaped copper sinters had a weak bending strength, resulting in the production of the undesirable shaped copper sinter.
  • the plastic copper containing clay compound in Example A including the mixed copper powder containing the first copper powder in 50 wt% with a mean particle diameter of 2.5 ⁇ m and the second copper powder in 50 wt% with a mean particle diameter of 10.0 ⁇ m, showed the most desirable result. Accordingly, it was confirmed that the conditions defined in the first aspect and the third aspect were more preferable. Note that the plastic copper containing clay compound in Comparative Example A and Comparative Example B showed the above mentioned undesirable results. However, when the above mentioned clay compounds were sintered in the argon atmosphere, the resultant shaped copper sinters sufficiently usable as a decorative article were obtained.
  • a mixed copper powder in 90 wt% [composition of the mixed powder by weight: a first copper powder (made of pure copper) in 50 wt% with a mean particle diameter of 2.5 ⁇ m and a second copper powder (made of pure copper) in 50 wt% with a mean particle diameter of 10 ⁇ m], methylcellulose in 1.20 wt% and sodium carboxymethylcellulose in 0.30 wt% used as organic binders, and water in 8.50 wt% were sufficiently mixed to form a copper clay-like compound.
  • a plastic silver containing clay compound was prepared by sufficiently mixing a mixed silver powder in 92 wt% [composition of the mixed powder by weight: a first silver powder (made of pure silver) in 50 wt% with a mean particle diameter of 2.5 ⁇ m and a second silver powder (made of pure silver) in 50 wt% with a mean particle diameter of 20 ⁇ m], and a water-soluble binder including starch in 0.7 wt%, cellulose in 0.80 wt% as organic binders, and the remainder of water.
  • the plastic silver containing clay compound and the plastic copper containing clay compound were weighed in the predetermined contents, respectively. Then, the respective compounds were shaped by fingers in a pillar-like shape with a width of 3 mm to form a rod shaped silver object and a rod shaped copper object, respectively. Then, the extended rod shaped silver object and the extended rod shaped copper object were put into a vacant syringe as they were without twisting the objects. If either of the rod shaped objects was longer, the end part of the longer object was folded to put the object into the syringe. Then, a pillar-like mixed rod shaped object was injected from the syringe.
  • a syringe of 2.0 ml having a cylinder inside length of 8 cm, an inside diameter of 6 mm, an inside diameter of an extrusion port of 1.4 mm (Top Co.,Ltd.; medical equipment registration No. 13B1x00085000023).
  • the rod shaped mixed object thus obtained was folded in two. And the folded two pieces of the rod shaped objects were intertwined at four times to form a pillar-like object.
  • the resultant pillar-like object was put into the syringe again, and a rod shaped mixed object was injected from the syringe.
  • the above mentioned operation was repeated at three times, whereby a rod shaped mixed object was obtained, which was integrally intertwined such that a linear shaped object of the copper containing clay compound was complicatedly entwined with a linear shaped object of the plastic silver containing composition.
  • the rod shaped mixed object thus obtained was injected onto a working bench to be wound in a plane spiral shape.
  • the upper surface of the object was flattened to form a plate shaped object, and the plate was pressed from the outside to form a flat plate-like object.
  • the flat plate-like object was spread flatly (a thickness of 1.5 mm) by a roller, and cut out the circumference thereof by a cutter to prepare a test piece (or shaped object) with a longitudinal length of about 15 mm and a width of about 15 mm.
  • the test piece was sintered in the air at 650°C for 30 min to 850°C for 5 min. The higher the sintering temperature was set, the shorter the sintering time was set. Note that in the air sintering process, the electric furnace was pre-heated at the above mentioned temperature, and the test piece was put in the electric furnace of which inside temperature was kept at the setting temperature, so as to conduct the air sintering process with maintaining the predetermined temperature and the time.
  • test piece After the sintering process, the test piece was put into water to be rapidly cooled. Accordingly, the oxidation film was well detached. Next, the test piece was immersed in a solid acid material for pickling and washing (trade name: Pickling Compound, GROBET FULE CO. OF AMERICA INC.; main ingredient: sodium hydrogen sulfate), thereby to remove the oxidation film of the surface of the sinter.
  • the surface of the sinter was polished by a stainless-steel brush where necessary, to thereby bring about a metallic luster. Accordingly, was obtained a test piece which had a surface layer pattern of marble tone created by two kinds (or two colors) of metals such as copper and silver.
  • test 5 was conducted in the sintering condition: at 800°C for 5 min, showing the result in Table 6. Further, the test 6 was conducted in the sintering condition: at 850°C for 5 min, showing the result in Table 7.
  • Good and “Middle” mean that the test piece has a usable value
  • “Poor” means that the test piece has no usable value.
  • the test piece evaluated as "Middle” has an appearance disadvantage that the marble pattern is hard to be distinguished in an aesthetic sense. Therefore, a decorative article with a different design has no appearance disadvantage, and has a sufficient strength for use.
  • the copper composition is a plastic copper containing composition and the silver compositionn is a plastic silver containing composition.
  • [Table 5] [Test 4] Sintering Conditions Weight Rate of Copper Composition / Silver Composition Condition After Sintering Evaluation Copper Silver Sinter the test piece in oxidation atomospher in an electric furnace, maintaining the temperature of 780°C for 5min. 83% 17% The test piece had the high strength. The surface thereof slightly had unevenness. Large content of the copper composition prevented recognition of the marble pattern. Poor 80% 20% Same result as mentioned above. Poor 75% 25% The test piece had the high strength. The surface thereof slightly had unevenness. Excellent in effective design of well balanced marble pattern. Poor (Put the test piece in an electric furnace, pre-heated at 780°C.
  • Test 1 Table 2
  • Test 4 Table 5
  • Test 5 Table 6
  • Test 6 Table 7
  • Test 2 Table 3
  • good results were obtained, irrespective of the rate between the copper containing clay compound and the silver containing clay compound. It was confirmed that the sintering conditions at 700°C for 15 min to at 750°C for 10 min was the conditions capable of conducting the good sintering for the shaped mixed copper-silver object.
  • the decorative object was able to be sintered in the air at 700 to 750°C for 10 to 15 min. Accordingly, a decorative article having a design excellent in a particularly well balanced arrangement of a copper color and a silver color, was able to be produced.
  • the plate-like object was spread flatly (a thickness of 1.5 mm) by a roller, and cut out the circumference thereof by a cutter to prepare a belt shaped object with a width of 10 mm.
  • the belt shaped object was wounded on a wood core rod of No. 16 type to shape it in a ring shaped material.
  • the resultant material was reshaped by rasping it to form a shaped object.
  • the shaped object was sintered in the air at 750°C for 10 min and subjected in the pickling treatment to form a ring which was shown in FIG.1 as a view of a proxy photograph.
  • the product was a decorative metallic article (or ring) with a marble pattern.
  • a mixed copper powder in 90 wt% [composition of the mixed powder by weight: a copper powder (made of pure copper) in 47.5 wt% with a mean particle diameter of 2.5 ⁇ m and another copper powder (made of pure copper) in 47.5 wt% with a mean particle diameter of 10 ⁇ m, and zirconium oxide in 5.0 wt%], and as organic binders, methylcellulose in 1.20 wt% and hydroxypropylmethylcellulose in 0.15 wt%, starch in 0.8 wt%, lignin in 0.10 wt%, and water in 7.75 wt% were sufficiently mixed to form a plastic copper containing clay compound.
  • a plastic silver containing clay compound was prepared as in the completely same method of aforementioned Example 2, by sufficiently mixing a mixed silver powder in 92 wt% [composition of the mixed powder by weight: a first silver powder (made of pure silver) in 50 wt% with a mean particle diameter of 2.5 ⁇ m and a second silver powder (made of pure silver) in 50 wt% with a mean particle diameter of 20 ⁇ m], and a water-soluble binder including starch in 0.7 wt%, cellulose in 0.80 wt% as organic binders, and the remainder of water.
  • each composition was spread flatly by a roller, and cut out the circumference thereof by a cutter to shape it in a substantially plate-like material. After drying the substantially plate-like material, the resultant material was reshaped by rasping it to form a shaped object.
  • a ring with a stand for fixing the shaped object was shaped only by using the aforementioned silver containing clay compound, and dried. Then, the resultant ring and the shaped object were integrally combined by using a paste prepared by dissolving the silver containing clay compound in water.
  • the integrally combined object was sintered in the air, and subsequently subjected in pickling treatment, to thereby obtain a decorative metallic article (or ring) with a marble pattern.
  • the decorative metallic article was shown as a view of a proxy photograph in FIG.2 .

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EP10809990A 2009-08-19 2010-08-19 Method for producing sintered copper article for craft or decorative use and copper-containing plastic composition Withdrawn EP2468435A1 (en)

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CN114807652B (zh) * 2021-12-24 2022-10-04 昆明冶金研究院有限公司北京分公司 一种艺术用粉末冶金复合材料的制备方法

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